module Jok
  class JokeFactory
    BASE_URI =  "http://www.laughfactory.com/jokes/".freeze

    def list
      @list ||= begin
        dom.xpath('//div[@class="left-nav"]/ul/li/a').map(&:text)
      end
    end

    def da
      joke
    end

    def method_missing(method, *args, &block)
      method = method.to_s
      super unless method_list.include? method

      self.class.class_eval <<-EOT, __FILE__, __LINE__ + 1
      def #{method}
        @#{method} ||= begin
          joke("#{method}")
        end
      end
      EOT

      send method
    end

    def method_list
      @method_list ||= begin
        list.map do |element|
          element.split(" ").map(&:downcase).join("_")
        end.push "da"
      end
    end

    private

    def dom(method="")
      response_body = HTTParty.get("#{BASE_URI}/#{method.gsub("_", "-")}")
      dom = Nokogiri::HTML(response_body)
    end

    def joke(topic="")
      dom(topic).xpath('//div[@class="joke3-pop-box"]/p').map(&:text).map(&:strip)
    end
  end
end